Build-to-Suit Lease - Additional Information (Detail) $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2015 ft² Option	Dec. 31, 2016 USD ($)
Operating Leased Assets [Line Items]
Property leased | ft²	41,400
Lease expiration date		Dec. 31, 2021
Operating lease expiration period	5 years
Number of lease term extension options | Option	2
Costs capitalized | $		$ 3.9
Maximum [Member]
Operating Leased Assets [Line Items]
Lease agreement, extendable lease term	10 years